GCSE - Gcse Chemistry - Electrolysis 2 Solution - MCQGeeks.com

Q.1.

What gas forms at the positive electrode during the extraction of aluminium?

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Hydrogen
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Chlorine
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Nitrogen
100%
Oxygen

Q.2.

Which of the following is NOT a use for chlorine?

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Kill bacteria
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Make bleach
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Make PVC
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Control pH

Q.3.

The hydrogen produced by the electrolysis of brine is NOT used to...

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make margarine
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make bleach
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make hydrochloric acid
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make hydrogen chloride gas

Q.4.

If graphite electrodes are used instead of copper in the electrolysis of copper sulfate, the equation that shows what happens at the anode is...

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H2O → H+ + O2 + e-
100%
Cu2+ + 2e- → Cu
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2H2O → 4H+ + O2+ 4e-
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Cu → Cu 2+ +2e-

Q.5.

When an electrical current is passed through brine (sodium chloride solution), three products are formed. They are...

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chlorine gas, hydrogen gas, sodium chloride solution
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chloride ions, hydrogen gas, sodium hydroxide solution
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chlorine gas, hydrogen gas, sodium hydroxide solution
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chlorine gas, hydrogen ions, sodium hydroxide solution

Q.6.

Pick the correct half equations for the electrolysis of copper sulfate using copper electrodes.

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Cathode: Cu(s) → Cu2+(aq) + 2e- Anode: Cu2+(aq) + 2e- → Cu(s)
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Cathode: Cu2+(aq) + 2e- → Cu(s) Anode: Cu(s)→ Cu2+(aq) + 2e-
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Cathode: Cu(s) → Cu+(aq) + e- Anode: Cu2+(aq) + 2e- → Cu(s)
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Cathode: Cu(s) → Cu2+(aq) + 2e- Anode: Cu+(aq) + e- → Cu(s)

Q.7.

Aluminium ore (bauxite) must be dissolved in molten cryolite before it can be electrolysed. Why?

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Raise the melting point
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Lower the melting point
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Increase its viscosity
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Reduce its viscosity

Q.8.

Choose the correct half equations for the electrolysis of brine.

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Anode 2Cl- → Cl2 + 2e- Cathode 2H+ + 2e- → H2
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Anode Cl- → Cl2 + e- Cathode 2H+ + e- → H2
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Anode 2Cl- → Cl2 + 2e- Cathode Na+ + e- → Na
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Anode Cl- → Cl + 2e- Cathode H+ + e- → H2

Q.9.

Copper can be purified using electrolysis. Pick the correct combination of components for the electrolytic cell.

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Cathode: Impure copper Anode: Pure copper Electrolyte: Copper sulfate
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Cathode: Pure copper Anode: Impure copper Electrolyte: Copper sulfate
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Cathode: Pure copper Anode: Pure copper Electrolyte: Copper sulfate
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Cathode: Impure copper Anode: Pure copper Electrolyte: Water

Q.10.

The third product from the electrolysis of brine is sodium hydroxide. This is NOT used to...

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make bleach
0%
make paper
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make soap
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make margarine